1. Working for the happiness of mankind is such a magnificent cause and how great this purpose is! ——Saint Simon

2. The greatest happiness possible for each person is the greatest happiness achieved by all people. ——Zola

3. True happiness can only be realized when you truly understand the value of life. ——Munir Nasuf

4. Happy are those who are interested in research! Happier are those who can free their minds from delusion and free themselves from vanity through research. ——Lametli

5. Treat the happiness of others as your own happiness, dedicate flowers to others, and keep the thorns to yourself! —— Valdez

6. As long as you have one reasonable thing to do, your life will be particularly beautiful. ——Einstein

7. Science is by no means a selfish pleasure. Those who are fortunate enough to devote themselves to scientific research should first use their knowledge to serve mankind. ——Marx

8. Even if you become a handful of dirt, as long as it is paved on the road to truth and your partners can stride forward, it will be the greatest happiness. ——Wu Yunduo

9. The purpose of all human efforts is to obtain happiness. ——Irving

10. Only a revolutionary, whether he lives or dies, can bring happiness to everyone. ——Lu Xun

11. Cows eat grass and horses eat food. Cows enjoy the least and contribute the most, so it is best to be a scalper. I am willing to serve the party and the people as a scalper for the rest of my life. ——Wang Jinxi

12. People find happiness in performing their duties. It's like a person carrying something on his back, but he feels very comfortable. If a person does not have it and does not perform any duties, it is like driving an empty car, that is, it is wasted. ——Rozov

13. My art should only benefit poor people. Ah, what a happy moment! How happy I will be when I can come close to this! ——Beethoven

14. Creation, or brewing future creation. It is a necessity: happiness can only exist when this necessity is satisfied. ——Romain Rolland

15. The more happiness is shared with others, the more its value increases. ——Seiichi Morimura